macro question

Hi,
 this is not related to strict c++ , but macro.
I want a statement to be generated like
std::size_t count = sizeof(trace2)/sizeof(coord_t);
	for (std::size_t i = 0; i< count; i += 2){
	  std::cout<<trace2[i]<<" "<<trace2[i+1]<<std::endl;
	}

when i write LOAD_TOKEN(2)

so the main problem is to essentially catenate "token" with a token
id.
I am looking at ##, but in between something fails to compile.
thanks
abir